Evaluation of Eryngium maritimum Essential Oil as Environmentally Friendly Corrosion Inhibitor for Mild Steel in Hydrochloric Acid Solution

• Published in: International journal of electrochemical science Vol. 8; no. 3; pp. 4328 - 4345
• Main Authors: Darriet, F., Znini, M., Majidi, L., Muselli, A., Hammouti, B., Bouyanzer, A., Costa, J.
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.03.2013
• Subjects: Adsorption; Corrosion Inhibition; Eryngium maritimum L; Essential oil; Mild steel; Essential oil; Mild steel; Adsorption; Eryngium maritimum L; Corrosion Inhibition
• ISSN: 1452-3981; 1452-3981
• DOI: 10.1016/S1452-3981(23)14473-7

Essential oil of aerial parts of Eryngium maritimum L. (EM oil) was obtained by hydrodistillation and analyzed by GC and GC/MS. After column chromatography (CC), 58 compounds accounting for 97.1 % of the oil were identified. The essential oil was dominated by oxygenated sesquiterpenes (57.9 %). The main components were 4βH-cadin-9-en-15-al (36.5 %), germacrene D (31.6 %), 4βH-cadin-9-en-15-ol (8.3 %) and 4βH-muurol-9-en-15-al (6.5 %). The inhibition of the corrosion of mild steel in 1M HCl solution by EM oil and its CC-fractions have been studied using weight loss measurements. Inhibition was found to increase with increasing concentration of the essential oil to attain 97.91 % at 2 mg/mL. The effect of temperature on the corrosion behavior of mild steel in 1M HCl without and with the EM oil at 2 mg/mL was also studied. The inhibition was assumed to occur via adsorption of the inhibitor molecules on the mild steel surface according to the Langmuir adsorption isotherm. The thermodynamic parameters for activation and adsorption processes were calculated and discussed. The results obtained showed that the EM oil could serve as an environmentally friendly inhibitor of the corrosion of mild steel in HCl media.